# Gemini 2.5 Flash-Lite vs GPT-5.3 Chat

> GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 36.4 on the Noometry Index. Gemini 2.5 Flash-Lite costs 27× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-2-5-flash-lite-vs-gpt-5-3-chat
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 1 category and GPT-5.3 Chat in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where GPT-5.3 Chat leads 42.6 to 33.3.
- Gemini 2.5 Flash-Lite is cheaper at $0.10 / $0.40 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Gemini 2.5 Flash-Lite accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 36.4 | 42.1 |
| Rank | 208 | 109 |
| Context | 1.05M | 128K |
| Input $/M | $0.10 | $1.75 |
| Output $/M | $0.40 | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.5 Flash-Lite: 38.0 (#167)
- GPT-5.3 Chat: 40.8 (#124)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1373 | 1408 |
| WeirdML | 35.2% | — |
| ALE-Bench | 325.9 | — |

## Agentic & Tool Use

- Gemini 2.5 Flash-Lite: 27.8 (#89)
- GPT-5.3 Chat: —

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| Berkeley Function Calling Leaderboard | 36.9% | — |

## Reasoning

- Gemini 2.5 Flash-Lite: 21.5 (#196)
- GPT-5.3 Chat: 27.3 (#105)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1377 | 1399 |
| Kagi LLM Benchmark | 40.5% | — |
| DTBench | 62.8% | — |
| LMCA | 18.1% | — |
| Epoch Capabilities Index | 133.93 | — |

## Math

- Gemini 2.5 Flash-Lite: 35.5 (#144)
- GPT-5.3 Chat: 35.4 (#146)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1373 | 1389 |
| Omni-MATH | 48% | — |

## Knowledge

- Gemini 2.5 Flash-Lite: 32.1 (#206)
- GPT-5.3 Chat: 38.2 (#137)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1373 | 1397 |
| MMLU-Pro | 53.7% | — |
| Vectara Hallucination Rate | 3.3% | — |
| GPQA (HELM) | 30.9% | — |

## Multimodal

- Gemini 2.5 Flash-Lite: 28.6 (#109)
- GPT-5.3 Chat: —

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Vision | 1198 | — |
| VPCT | 30% | — |

## Multilingual

- Gemini 2.5 Flash-Lite: 49.5 (#129)
- GPT-5.3 Chat: 50.5 (#119)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1369 | 1383 |
| LMArena Chinese | 1404 | 1433 |
| LMArena French | 1388 | 1398 |
| LMArena German | 1390 | 1384 |
| LMArena Japanese | 1359 | 1351 |
| LMArena Korean | 1358 | 1347 |
| LMArena Russian | 1373 | 1400 |
| LMArena Spanish | 1396 | 1371 |

## Instruction Following

- Gemini 2.5 Flash-Lite: 70.2 (#163)
- GPT-5.3 Chat: 73.0 (#124)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1366 | 1378 |
| IFEval | 81% | — |

## Long Context

- Gemini 2.5 Flash-Lite: 33.3 (#257)
- GPT-5.3 Chat: 42.6 (#115)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1373 | 1396 |
| Fiction.LiveBench | 47.2% | — |

## Writing & Preference

- Gemini 2.5 Flash-Lite: 57.0 (#130)
- GPT-5.3 Chat: 63.3 (#65)

| Benchmark | Gemini 2.5 Flash-Lite | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1379 | 1389 |
| LMArena Creative Writing | 1366 | 1356 |
| LMArena Multi-Turn | 1367 | 1413 |
| EQ-Bench Creative Writing | — | 1690 |
| WildBench | 81.8% | — |

## FAQ

### Is Gemini 2.5 Flash-Lite better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 36.4 on the Noometry Index. Gemini 2.5 Flash-Lite costs 27× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

### Which is cheaper, Gemini 2.5 Flash-Lite or GPT-5.3 Chat?

Gemini 2.5 Flash-Lite is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is Gemini 2.5 Flash-Lite or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 38.0 in the Noometry coding category.

### Which has the bigger context window?

Gemini 2.5 Flash-Lite does, with 1.05M tokens against 128K.

### How many benchmarks do Gemini 2.5 Flash-Lite and GPT-5.3 Chat share?

17 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and GPT-5.3 Chat has 18.